Troubleshooting
Washer fluid level too low
The indicator lamp lights up yellow.
Fill up the washer fluid reservoir as soon as possible (→ Washer fluid, Refilling).
Fault in rain/light sensor
The indicator lamp lights up yellow.
The wipers are not switched on automatically if it rains during rain/light sensor operation.
—Switch the ignition off and on.
—If the fault persists, seek expert assistance.
Fault in wipers
The indicator lamp lights up yellow.
The wipers do not wipe.
—Switch the ignition off and on.
—If the fault persists, seek expert assistance.
Changes in the response of the rain/light sensor
Possible causes for faults and misinterpretations relating to the sensitive surface of the rain/light
sensor (→ Front view, Overview) include:
—Damaged wiper blades: a film of water or smears caused by damaged wiper blades can
increase the time the wipers are switched on, can shorten the length of the intervals between
wipes or cause the wipers to run quickly and continuously.
—Insects: insects hitting the windscreen surface can cause the wipers to be activated.
—Salt deposits: in winter, salt deposits can cause the wipers to continue to wipe the windscreen
when it is almost dry.
—Soiling: dry dust, wax, windscreen coatings (lotus effect), or detergent deposits (from an
automatic car wash) can cause the rain/light sensor to become less sensitive and react too
slowly, or prevent it from reacting at all. Clean the sensitive surface of the rain/light sensor at
regular intervals and inspect the wiper blades for damage (→ Vehicle care, exterior,
Cleaning/Care).
—Crack in the windscreen: a wipe cycle will be triggered if the rain/light sensor is switched on
when the windscreen is impacted by a stone. The rain/light sensor will then register the
reduction in sensitivity of the surfaces and adjust accordingly. The size of the crack can affect
the way in which the rain/light sensor activates the wipers.
We recommend that you use an alcohol-based glass cleaner to remove wax and polish.
The wipers will try to wipe away any obstacles that are on the window. The wipers will
stop moving if the obstacle blocks their path. Remove the obstacle and switch the
wipers back on again.
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